US8438938B1 - Load cell - Google Patents
Load cell Download PDFInfo
- Publication number
- US8438938B1 US8438938B1 US12/857,640 US85764010A US8438938B1 US 8438938 B1 US8438938 B1 US 8438938B1 US 85764010 A US85764010 A US 85764010A US 8438938 B1 US8438938 B1 US 8438938B1
- Authority
- US
- United States
- Prior art keywords
- insert
- flanges
- shaft
- sleeve
- load cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/2206—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
- G01L1/2231—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports the supports being disc- or ring-shaped, adapted for measuring a force along a single direction
Definitions
- This invention relates to load cells used in measuring forces applied to shafts, including both rotating shafts and non-rotating so called “dead” shafts.
- Load cells for measuring forces exerted on shafts are known, as evidenced for example by the disclosures in U.S. Pat. Nos. 4,099,409 (Edmond); 4,958,525 (Hauer et al); 6,220,105 (Cripe); and 6,370,971 (Olson).
- a drawback with these known devices is their lack of compactness, which precludes their use in confined spaces.
- Such devices also have unduly complex structures, which are difficult to machine and assemble, all of which contributes to disadvantageously high costs.
- a primary objective of the present invention is the provision of a load cell having a compact structure, making it useful in confined spaces that are often found in modern day equipment designs.
- a companion objective of the present invention is the provision of a load cell designed for ease of machining and assembly, thus reducing manufacturing costs.
- a load cell in accordance with the present invention comprises an insert defining a hub having a central opening dimensioned to receive a shaft.
- the insert is removably fixed to the shaft, and a cylindrical sleeve is configured and dimensioned to surround the insert.
- the sleeve is machined with interior notches.
- the insert is suspended and rotatably fixed within the sleeve by flanges which are integral with and project from the insert's hub into the sleeve's interior notches.
- the flanges are configured to respond with deformation to forces applied to the shaft, and strain gauges bonded to the flanges exhibit changes in resistance according to the degree of flange deformation.
- FIG. 1 is a front view of a load cell in accordance with a preferred embodiment of the present invention
- FIG. 2 is a side elevational view of the load cell
- FIG. 3 is a sectional view taken along line 3 - 3 of FIG. 1 ;
- FIG. 4 is a sectional view taken along line 4 - 4 of FIG. 2 ;
- FIG. 5 is a perspective view of the insert component.
- a load cell 10 includes an insert 12 defining a hub 12 a with a central opening dimensioned to receive a shaft 14 .
- a set screw 16 or other equivalent means serves to rotatably fix the insert to the shaft.
- a cylindrical sleeve 18 is configured and dimensioned to surround and enclose the insert 12 .
- the sleeve 18 is adjustably mounted within an outer housing 20 .
- the insert 12 is suspended and rotatably fixed within the sleeve by flanges 12 b which are integral with the hub 12 a.
- the flanges have intermediate sections curving back towards the hub and then radially outwardly to form distal ribs 12 c received in grooves in the interior surface of the sleeve.
- the intermediate flange sections have flat outer surfaces 24 on which are bonded strain gauges 26 .
- the flanges 12 b are configured to respond with deformation to forces applied to the shaft 14 , with the strain gauges exhibiting changes in resistance according to the degree of flange deformation.
- the load cell is advantageously compact in size due in large measure to the unique configuration of the flanges 12 b and their close confinement within the sleeve 18 .
- the major components of the load cell are configured for ease of machining and assembly.
Abstract
Description
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/857,640 US8438938B1 (en) | 2009-09-01 | 2010-08-17 | Load cell |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US23871909P | 2009-09-01 | 2009-09-01 | |
US12/857,640 US8438938B1 (en) | 2009-09-01 | 2010-08-17 | Load cell |
Publications (1)
Publication Number | Publication Date |
---|---|
US8438938B1 true US8438938B1 (en) | 2013-05-14 |
Family
ID=48225334
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/857,640 Expired - Fee Related US8438938B1 (en) | 2009-09-01 | 2010-08-17 | Load cell |
Country Status (1)
Country | Link |
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US (1) | US8438938B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11085838B2 (en) * | 2019-03-10 | 2021-08-10 | Ati Industrial Automation, Inc. | Force/torque sensor having serpentine or coiled deformable beams and overload beams |
TWI803196B (en) * | 2022-02-15 | 2023-05-21 | 介隆興齒輪股份有限公司 | Bicycle bottom bracket torque detection mechanism |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4099409A (en) | 1977-07-05 | 1978-07-11 | The Bendix Corporation | Multi-axis load cell with arcuate flexures |
US4259863A (en) * | 1979-12-03 | 1981-04-07 | General Motors Corporation | Multi-axis load cell |
US4723450A (en) * | 1986-11-04 | 1988-02-09 | General Electric Company | Method and apparatus for measuring torque |
US4958525A (en) | 1988-07-02 | 1990-09-25 | Koenig & Bauer Aktiengesellschaft | Web tension measuring assembly |
US5513536A (en) * | 1993-01-28 | 1996-05-07 | Robert Bosch Gmbh | Pressure, force and torque measuring device |
US5589828A (en) * | 1992-03-05 | 1996-12-31 | Armstrong; Brad A. | 6 Degrees of freedom controller with capability of tactile feedback |
US5925832A (en) * | 1997-10-01 | 1999-07-20 | Gagetek Company | Torsional sensing load cell |
US6220105B1 (en) | 1999-04-16 | 2001-04-24 | Magna-Lastic Devices, Inc. | Magnetoelastic disc-shaped load cell having spiral spokes |
US6370971B1 (en) | 2000-10-23 | 2002-04-16 | Tedea-Huntleigh, Inc. | Pulley hub load cell |
US6711960B2 (en) * | 2001-05-31 | 2004-03-30 | Teac Corporation | Compact load cell with arm tension absorption means and arm reinforcement means |
US7679009B2 (en) * | 2006-01-24 | 2010-03-16 | Zhongshan Transtek Electronics Co., Ltd. | Weighing sensor for an electronic scale and an electronic scale |
US20110314935A1 (en) * | 2009-02-06 | 2011-12-29 | Abb Ag | Set of multiaxial force and torque sensor and assembling method |
US8161828B1 (en) * | 2009-09-29 | 2012-04-24 | Interface, Inc. | Load cell for monitoring torsion and having over load protection |
-
2010
- 2010-08-17 US US12/857,640 patent/US8438938B1/en not_active Expired - Fee Related
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4099409A (en) | 1977-07-05 | 1978-07-11 | The Bendix Corporation | Multi-axis load cell with arcuate flexures |
US4259863A (en) * | 1979-12-03 | 1981-04-07 | General Motors Corporation | Multi-axis load cell |
US4723450A (en) * | 1986-11-04 | 1988-02-09 | General Electric Company | Method and apparatus for measuring torque |
US4958525A (en) | 1988-07-02 | 1990-09-25 | Koenig & Bauer Aktiengesellschaft | Web tension measuring assembly |
US5589828A (en) * | 1992-03-05 | 1996-12-31 | Armstrong; Brad A. | 6 Degrees of freedom controller with capability of tactile feedback |
US5513536A (en) * | 1993-01-28 | 1996-05-07 | Robert Bosch Gmbh | Pressure, force and torque measuring device |
US5925832A (en) * | 1997-10-01 | 1999-07-20 | Gagetek Company | Torsional sensing load cell |
US6220105B1 (en) | 1999-04-16 | 2001-04-24 | Magna-Lastic Devices, Inc. | Magnetoelastic disc-shaped load cell having spiral spokes |
US6370971B1 (en) | 2000-10-23 | 2002-04-16 | Tedea-Huntleigh, Inc. | Pulley hub load cell |
US6711960B2 (en) * | 2001-05-31 | 2004-03-30 | Teac Corporation | Compact load cell with arm tension absorption means and arm reinforcement means |
US7679009B2 (en) * | 2006-01-24 | 2010-03-16 | Zhongshan Transtek Electronics Co., Ltd. | Weighing sensor for an electronic scale and an electronic scale |
US7947912B2 (en) * | 2006-01-24 | 2011-05-24 | Zhongshan Transtek Electronics Co., Ltd. | Weighing sensor for an electronic scale and electronic scale |
US20110314935A1 (en) * | 2009-02-06 | 2011-12-29 | Abb Ag | Set of multiaxial force and torque sensor and assembling method |
US8161828B1 (en) * | 2009-09-29 | 2012-04-24 | Interface, Inc. | Load cell for monitoring torsion and having over load protection |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11085838B2 (en) * | 2019-03-10 | 2021-08-10 | Ati Industrial Automation, Inc. | Force/torque sensor having serpentine or coiled deformable beams and overload beams |
TWI803196B (en) * | 2022-02-15 | 2023-05-21 | 介隆興齒輪股份有限公司 | Bicycle bottom bracket torque detection mechanism |
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AS | Assignment |
Owner name: PARKINSON TECHNOLOGIES, INC., RHODE ISLAND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CAVANAGH, KENNETH M;REEL/FRAME:024844/0932 Effective date: 20100817 |
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STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
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FPAY | Fee payment |
Year of fee payment: 4 |
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FEPP | Fee payment procedure |
Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY |
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LAPS | Lapse for failure to pay maintenance fees |
Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY |
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STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
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FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20210514 |